Too much of it could subconsciously increase your dissatisfaction with your sex life if you're in a committed relationship. You run the risk of bedroom stagnation in such relationships even without outside influences. The fantasy experience most porn grants access can accentuate the monotony that characterizes the sex lives of long-time partners.

Personally, my sex life has been more fulfilling when the porn viewing is limited or even eliminated (usually only happens at the beginning of the relationship when things are still fresh).

Also, haven't you voiced a concern with your girlfriend's appearance/weight before? That's going to play a role in how frisky you're feeling.

Been in a relationship for 5 years, and personally ive had no sex drive for most of it i find myself looking at porn generally not because i want to beat off, but more because im bored. but i check out porn quite a bit in my spare time on the computer. what are your thoughts?